import isEqual from 'lodash/isEqual';
import keys from 'lodash/keys';
import pick from 'lodash/pick';
import includes from 'lodash/includes';

let REQUIRED_FIELDS = ['hitType', 'eventCategory', 'eventAction'];
let ALLOWED_HIT_TYPES = [
  'pageview',
  'screenview',
  'event',
  'transaction',
  'item',
  'social',
  'exception',
  'timing',
];


export default {
  methods: {
    register (user) {
      // @TODO: What is was the timeout for?
      window.amplitude.setUserId(user._id);
      window.ga('set', {userId: user._id});
    },
    login (user) {
      window.amplitude.setUserId(user._id);
      window.ga('set', {userId: user._id});
    },
    track (properties) {
      if (this.doesNotHaveRequiredFields(properties)) return false;
      if (this.doesNotHaveAllowedHitType(properties)) return false;

      window.amplitude.logEvent(properties.eventAction, properties);
      window.ga('send', properties);
    },
    updateUser (properties, user) {
      properties = properties || {};

      this.gatherUserStats(user, properties);

      window.amplitude.setUserProperties(properties);
      window.ga('set', properties);
    },
    gatherUserStats (user, properties) {
      if (user._id) properties.UUID = user._id;
      if (user.stats) {
        properties.Class = user.stats.class;
        properties.Experience = Math.floor(user.stats.exp);
        properties.Gold = Math.floor(user.stats.gp);
        properties.Health = Math.ceil(user.stats.hp);
        properties.Level = user.stats.lvl;
        properties.Mana = Math.floor(user.stats.mp);
      }

      properties.balance = user.balance;
      properties.balanceGemAmount = properties.balance * 4;

      properties.tutorialComplete = user.flags && user.flags.tour && user.flags.tour.intro === -2;
      if (user.habits && user.dailys && user.todos && user.rewards) {
        properties['Number Of Tasks'] = {
          habits: user.habits.length,
          dailys: user.dailys.length,
          todos: user.todos.length,
          rewards: user.rewards.length,
        };
      }
      if (user.contributor && user.contributor.level) properties.contributorLevel = user.contributor.level;
      if (user.purchased && user.purchased.plan.planId) properties.subscription = user.purchased.plan.planId;
    },
    doesNotHaveRequiredFields (properties) {
      if (!isEqual(keys(pick(properties, REQUIRED_FIELDS)), REQUIRED_FIELDS)) {
        // @TODO: Log with Winston?
        //  console.log('Analytics tracking calls must include the following properties: ' + JSON.stringify(REQUIRED_FIELDS));
        return true;
      }
    },
    doesNotHaveAllowedHitType (properties) {
      if (!includes(ALLOWED_HIT_TYPES, properties.hitType)) {
        // @TODO: Log with Winston?
        //  console.log('Hit type of Analytics event must be one of the following: ' + JSON.stringify(ALLOWED_HIT_TYPES));
        return true;
      }
    },
  },
};